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MAIN/SECONDARY BEAM CONNECTION JOINT WITH CROSSED FULL-THREAD SCREWS TYPE GWZ AND GWS

CALCULATION REPORT OF MAIN/SECONDARY BEAM CONNECTION Shear joint with crossed full-thread screws type GWZ and GWS Last edit date Customer Work site Drafted by Regulations of reference Connection position Connection description

Tuesday, January 24, 2017

EN 1995-1-1: 2008 Connection 1

CONNECTION GEOMETRY Main beam Material Resistance class Width Height Characteristic density Secondary beam Material Resistance class Width Height Vertical inclination Characteristic density

Solid softwood C 14 bHT = 220 mm hHT = 400 mm ρK,HT = 290 kg/m3 Solid softwood C 14 bNT = 220 mm hNT = 260 mm βNT,v = 15 ° ρK,NT = 290 kg/m3

DESIGN LOADS Standards reference EN 1995-1-1: 2008 As regards mechanical strength and screw geometry values, refer to ETA-11/0030 Design loads Shear design Service class Load duration class Load duration coefficient and humidity

Vd = 10 kN Class 1 Permanent kmod = 0.6

Partial safety factors Wooden element junctions Screw shank steel tensile stress

γM = 1.3 γM = 1.25

CHOICE OF THE FASTENING Fastening type Screw type Head type Screw geometry

Full-thread screw type GWS Countersunk head Ø 11 x 250 mm

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MAIN/SECONDARY BEAM CONNECTION JOINT WITH CROSSED FULL-THREAD SCREWS TYPE GWZ AND GWS

VERIFICATIONS Screw geometry Nominal diameter Screw length Effective calculation length of the thread

d1 = 11 mm L = 250 mm Lef = L/2-20 mm = 105 mm

Withdrawal capacity - Main beam Screw-grain angle direction Withdrawal capacity

αHT = 90°

Fax,HT,Rk = 11626 N Withdrawal capacity - Secondary beam Screw-grain angle direction Withdrawal capacity

αNT = 30°

Fax,NT,Rk = 10110 N Connection design capacity: withdrawal Number of pairs Effective number of pairs

nC = 2 nef = 1.87

Characteristic connection capacity VR,k = 26.68 kN Partial safety factor for timber connection Load duration coefficient and humidity Connection design capacity

γM = 1.3 kmod = 0.6

VRd = 12.31 kN ≥ Vd Connection design capacity: screw shank steel tensile stress Characteristic tensile strength Characteristic connection capacity

(η = 81.21%)

Ftens,Rk = 38 kN VRk = 100.28 kN

Partial safety factor for steel structure Connection design capacity

γM = 1.25

VRd = 80.23 kN ≥ Vd

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(η = 12.46%)

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MAIN/SECONDARY BEAM CONNECTION JOINT WITH CROSSED FULL-THREAD SCREWS TYPE GWZ AND GWS

CONNECTION DESCRIPTION Type of screws Catalogue code Bit

GWS Ø 11 x 250 - 4 screws (2crossed pairs) GWS11250 TX 50 (included in package)

Section mHT pHT

mNT

sHT

sNT 45°

Assembly distance of main beam Assembly distance Insertion depth Insertion depth Screw-in angle

mHT = 135 mm sHT = 65 mm pHT = 46 mm αv = 45 °

hHT

qNT

ENT,v

hNT NT

HT bHT

Assembly distance of secondary beam Assembly distance Insertion depth Distance from lower edge Screw-in angle Vertical inclination

mNT = 110 mm sNT = 25 mm qNT = 68 mm αv = 60 ° βNT,v = 15 °

Distances from edges and spacing Minimum screw spacing Minimum screw spacing Minimum distance from edge

a1,min = 5 d1 = 55 mm a2,cross,min = 1,5 d1 = 17 mm a2,c,min = 4 d1 = 44 mm

Screw spacing Screw spacing Distance from edge

a1 = 55 mm a2,cross = 17 mm a2,c = 74 mm

Plan - 2 or more pairs b NT a2,cross a2,c

a2,c

b HT a1

Note: Screws can be repositioned in compliance with above indicated minimum distances.

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MAIN/SECONDARY BEAM CONNECTION JOINT WITH CROSSED FULL-THREAD SCREWS TYPE GWZ AND GWS

NOTES 1 All calculations must be verified and approved by the designer/engineer in charge of the works.

2 This calculation report is valid only for main/secondary beam connections made using crossed full thread screws type GWZ and GWS. 3 As regards mechanical strength and screw geometry values, refer to ETA-11/0030 4 When verifying connected wood elements, also verify any orthogonal traction stresses induced by the connection: hanged load for main beam and carved bearing support for secondary beam.

5 The main beam must be fixed and verified taking into account the torsion deriving from connection eccentricity.

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